Hansen Trine Lund, Jansen Jes la Cour, Davidsson Asa, Christensen Thomas Højlund
Institute of Environment and Resources, Technical University of Denmark, 2800 Kongens Lyngby, Denmark.
Waste Manag. 2007;27(3):398-405. doi: 10.1016/j.wasman.2006.02.014. Epub 2006 May 5.
Source-sorted municipal organic waste collected from different dwelling types in five Danish cities and pre-treated at three different plants was sampled and characterized several times during one year to investigate the origin of any differences in composition of the pre-treated waste introduced by city, pre-treatment technology, dwelling type or annual season. The investigated pre-treatment technologies were screw press, disc screen and shredder+magnet. The average quantity of pre-treated organic waste (biomass) produced from the incoming waste varied between the investigated pre-treatment technologies: 59%, 66% and 98% wet weight, respectively (41%, 34% and 2% reject, respectively). The pre-treatment technologies showed differences with respect to distribution of the chemical components in the waste between the biomass and the rejected material (reject), especially for dry matter, ash, collection bag material (plastic or paper) and easily degradable organic matter. Furthermore, the particle size of the biomass was related to the pre-treatment technology. The content of plastic in the biomass depended both on the actual collection bag material used in the system and the pre-treatment technology. The sampled reject consisted mostly of organic matter. For cities using plastic bags for the source-separated organic waste, the expected content of plastic in the reject was up to 10% wet weight (in some cases up to 20%). Batch tests for methane potential of the biomass samples showed only minor variations caused by the factors city, pre-treatment technology, dwelling type and season when based on the VS content of the waste (overall average 459STPm(3)/tVS). The amount of methane generated from 1t of collected waste was therefore mainly determined by the efficiency of the chosen pre-treatment technology described by the mass distribution of the incoming waste between biomass and reject.
从丹麦五个城市的不同居住类型收集并在三个不同工厂进行预处理的源头分类城市有机废物，在一年中进行了多次采样和特性分析，以调查城市、预处理技术、居住类型或年度季节所引入的预处理废物成分差异的来源。所研究的预处理技术为螺旋压榨机、圆盘筛和切碎机+磁选机。不同预处理技术处理后的有机废物（生物质）平均产量各不相同：湿重分别为59%、66%和98%（相应的拒收物分别为41%、34%和2%）。预处理技术在生物质和拒收物（废料）之间的废物化学成分分布方面存在差异，特别是对于干物质、灰分、收集袋材料（塑料或纸张）和易降解有机物。此外，生物质的粒径与预处理技术有关。生物质中塑料的含量既取决于系统中实际使用的收集袋材料，也取决于预处理技术。所采样的拒收物主要由有机物组成。对于使用塑料袋进行源头分类有机废物收集的城市，拒收物中塑料的预期含量高达湿重的10%（在某些情况下高达20%）。基于废物的挥发性固体（VS）含量，生物质样品的甲烷潜力批次试验表明，城市、预处理技术、居住类型和季节等因素仅导致微小差异（总体平均为459STPm³/tVS）。因此，1吨收集废物产生的甲烷量主要取决于所选预处理技术的效率，该效率由进入废物在生物质和拒收物之间的质量分布来描述。
